adverb (r)

• in a dim indistinct manner(adv.all)

  Example:
  We perceived the change only dimly.
  

  Synonym:
  indistinctly
  

  source: wordnet30
• in a manner lacking interest or vitality(adv.all)

  Synonym:
  palely, pallidly
  

  source: wordnet30
• with a dim light(adv.all)

  Example:
  A dimly lit room.
  

  Synonym:
  murkily
  

  source: wordnet30
• In a dim or obscure manner; not brightly or clearly; with imperfect sight.(adverb)

  source: webster1913